Bill deformities in songbirds

This compilation of bill deformities is property of the Rouge River Bird Observatory. Do not use or cite without written permission. Copyright for photos is held by photographers. Please do not use without permission from individual listed.

Flycatchers to Horned Lark (pg 1; updated 31 March 2014)
Swallows through bluebirds (below, updated 31 March 2014)
Thrushes through European Starling (pg 3, updated 31 March 2014)
Warblers through towhees (pg 4, updated 3 Sep 2013)
Sparrows through orioles (pg 5, updated 31 March 2014)
Crossbills through House Sparrow + Literature Cited (p6, updated 27 Aug 2013)
Bill Tumors, Most Due to Avian Pox (not being updated)


Swallows through bluebirds


Species

Details

Source

Barn Swallow (Hirundo rustica)13 Aug 2008; HY-U; Harrison Twp., Macomb Co., MI; maxilla strongly curvedAllen Chartier (amazilia1 AT comcast DOT net)
Barn Swallow24 March 2009; Holbrook, AZ; maxilla slightly elongated and hooked Eric Hough (erh36 AT nau DOT edu)

 

Carolina Chickadee (Poecile carolinensis)late Oct 2005; U-U; Crosby, Harris Co., TX; maxilla twice as long as lower, curved downRicci Deibert (riccideibert
AT hotmail.com)
Chestnut-backed Chickadee
(Poecile rufescens)
Alaska(libor@atlas.geomatics.com)
Chestnut-backed Chickadee10 Oct 2006; U-U; Goleta, CA; maxilla shortJim Greaves (LBVIMAN AT
BLACKFOOT.NET)
Black-capped Chickadee (Poecile atricapillus)southcentral Alaska; 500+ birds, mostly with very elongated maxillas since 1991Colleen Handel (colleen_handel
AT usgs.gov) USGS Alaska Biological Science Center (click here for more info);  Van Hemert 2007
Black-capped ChickadeeKenabeek, OntarioKinch 1998
Black-capped Chickadee11 Oct 2005; HY-U; maxilla was elongated and crossed; Rector, PA
Powdermill Nature Reserve, Robert S. Mulvihill (mulvipnr AT westol DOT com)
Black-capped Chickadee (?)26 Nov 2006; HY-U; maxilla 9mm long and twisted left, mandible 7mm and twisted right, bird also small, possibly Carolina
Chickadee (P. carolinensis) or hybrid; Schuylkill Haven, PA
Scott Weidensaul (scottweidensaul AT
verizon DOT net)
Black-capped Chickadee2007; U-U; maxilla slightly elongated; Whidbey Island, Island Co., WACraig Johnson (highseasmarine AT
comcast.net)
Black-capped Chickadee3 Jan 2009; both maxilla and mandible elongated and crossed; South Euclid, OHJim Heflich (laureldocAT sbcglobal
DOT net)
Black-capped Chickadee26 Mar 2011; AHY-U; Fairbanks, AK; maxilla elongated and decurvedFlickr
Black-capped Chickadee30 Dec 2010; U-U; Vermont; maxilla nearly missing, mandible elongated and curved upFlickr
Tufted Titmouse (Baeolophus
bicolor
)
1 Feb 1999; SY-U; Rector, PA; maxilla crossed rightPowdermill Nature Reserve, Robert S. Mulvihill (mulvipnr AT westol DOT com)
Red-breasted
Nuthatch
(Sitta canadensis)
28 Mar 2004; AHY-M; Dearborn, MI; mandible elongated and crossed to rightRouge River Bird Observatory, Julie Craves (jac.rrbo AT gmail DOT com)
Red-breasted Nuthatch17 Jan 2012; AHY-U (F?); northwest Michigan (Traverse City area); both very elongated, but straightFlickr
White-breasted
Nuthatch
(Sitta carolinensis)
Winter 2001-02; U-U; Gardener, MA; both elongated, crossedSigrid Warren
(kolibri23 AT msn.com)
White-breasted Nuthatch8 Mar 2004; AHY-F; Grosse Pointe, MI; mandible greatly elongated and crossing up and to left, maxilla moderately elongated and crossing down and to rightBill Rapai via Rouge River Bird Observatory, Julie Craves (jac.rrbo AT gmail DOT com)
White-breasted Nuthatch25 Apr 2003; Jackson, NH; 'very crossed'Scott Woodman (scotttheguy AT msn.com)
White-breasted NuthatchLate April to mid-May 2008; AHY-M (?); Mohnton, Berks Co., PA; both maxilla and mandible extremely elongatedDeb Sardone
(ALineAcross AT aol DOT com)
White-breasted Nuthatch1 December 2008; Empire Gulch, Las Cienegas National Conservation Area, near Sonoita, AZ; both maxilla and mandible extremely elongatedJim Lawrence (jlmotmot AT yahoo DOT com)
White-breasted Nuthatch5 Dec 2010; probable male; Butlerville, OH; maxilla elongated and crossed to right, mandible elongated and possibly curving upwardDoug Gilham (cr8zyhorse AT tds DOT net)
White-breasted Nuthatch6 April 2007; AHY-M; New Bern, Craven Co., NC; maxilla and mandible slightly elongated(?, notes from rehabber indicated "had long bill syndrome"); specimen at NC State Museum of
Natural Sciences
Becky Desjardins
White-breasted NuthatchFall 2011 to at least 7 Dec 2011; U-M; Montague, MI; both very elongatedFlickr
White-breasted NuthatchEarly February 2013; AHY-M; Newark, OH; maxilla and mandible extremely elongatedVia Ohio Birds and Biodiversity blog
White-breasted Nuthatch20 Jan 2014; AHY-M; Streator, IL; maxilla elongated and crossed over elongated and blunt mandibleFlickr
Brown-headed
Nuthatch
(Sitta pusilla)
Photo dated April 2007; both maxilla and mandible grossly elongated, gapped; Atlanta, GAFlickr
Brown-headed Nuthatch6 Dec 2011; U-U; Decatur, DeKalb Co., GA; maxilla elongated and slightly downcurved, forming a gap with the mandibleRebecca Kerimbaev (rebecca DOT kerimbaev AT gmail DOT com)
Brown Creeper (Certhia americana)27 Oct 1996; HY-U; Rector, PA; maxilla and mandible crossedPowdermill Nature Reserve, Robert S. Mulvihill (mulvipnr AT westol DOT com)
Brown Creeper12 Nov 2012; U-U; Marsh Creek State Park, Chester Co., PA; crossedFlickr
Carolina Wren (Thryothorus ludovicianus)3 Dec 2013; AHY-U; North Point State Park Baltimore Co., MD; both maxilla and mandible elongated and decurvedFlickr
Cactus Wren
(Campylorhynchus brunneicapillus)
Mid-February 2009; AHY-U; maxilla and mandible appear crossed at tips; Desert Botanical Garden, Phoenix, AZTina Wynecoop (wynecoop AT hotmail DOT com); This may be the same bird shown in this photograph ; same location, same year.
Cactus Wren1 May 2009; AHY-U; Tucson, AZ; maxilla and mandible very elongated and curved downwardsJoan Gellatly on Flickr
Winter Wren (Troglodytes
hiemalis
)
29 Sep 2006; HY-U; Tip of mandible broken off, maxilla appeared extra long and downcurved; Metro Beach Metropark, Macomb Co., MIAllen Chartier (amazilia1
AT comcast.net)
Winter Wren18 Oct 2011; HY-U; Dearborn, MI; bill slightly elongated and crossed at tip, maxilla tip spoon-shapedRouge River Bird Observatory, Julie Craves (jac.rrbo AT gmail DOT com)
American Dipper (Cinclus mexicanus)Spring 2004; bird banded as normal juvenile 18 Jul 2003 in Whitewood Creek, SD returned dead with bill slightly crossed at tipDoug Backlund (Doug.Backlund
AT state.sd.us)
Golden-crowned
Kinglet
(Regulus satrapa)
HY-F; 20 Oct 02; Holiday
Beach, Essex Co., Ontario, Canada
Allen Chartier (amazilia1 AT comcast.net
Golden-crowned Kinglet1 Nov 2011; HY-M; maxilla slightly elongated and hooked; Pelee Is. Bird Obs., Pelee Island, Essex Co., ONFlickr
Eastern Bluebird (Sialia sialis)3 Feb 2013; AHY-F; Lodi Twp., Washtenaw Co., MI: bill crossed approx. at mid-way pointRouge River Bird Observatory, Julie Craves (jac.rrbo AT gmail DOT com)
Western Bluebird (Sialia
mexicana
)
U.S.Eltzroth 1996
Mountain Bluebird
(Sialia currucoides
late March 2008; Sanders Co MT; maxilla slightly elongaged and hookedJim Greaves (LBVIMAN AT BLACKFOOT.NET)

Maxilla = Top, Mandible = Bottom.

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